Black is being pressured at the midpoint of the board.
However, black has 2 pawns in hand as well as rook at 8i and bishop at 7h
keeping their eyes on the 8th file. It is thus still possible to recover
his losses.

In this position, black played 1. P-8e Px8e 2. P*8d to counterattack
the rook's head. Although this play belongs to "attack" rather than "defense",
I dared to introduce this as a "defense of counterattack" because black has a
great defensive move afterwards.

If, in the main line after 1... Px8e, black plays 2. P*8c, then 2...Rx8c
3. P*8d R-8a 4. Nx8e P-4e (Diagram B). In Diagram B, white's 5... Gx7c is
a good answer to 5. Nx7c+ and the defense of the 8th file holds strong.

Diagram BAfter 4... P-4e

Therefore 2. P*8c is an overplay. 2. P*8d, dropping the pawn one square
further back (Tare-fu = "Hanging Pawn"), is correct.

The purpose of 3. K-1h is to dodge white's counterattack before it
happens. This technique (tesuji) is called "hayanige" or "early escape".
If black hurries to attack with 3. Nx8e instead, his position will be
disadvantageous after 3... P-5f 4. Sx5f Nx8e 5. Rx8e N*4d (Diagram D).
The Knight drop at 4d interestingly aims not only at the silver on 5f,
but the fork of king and bishop by to Nx3f. 3. K-1h avoids this.

In Diagram E, black's P-8c+ will be very brutal. Even though white
defends with ...G-7c, black has N*9e that is an attack by force of numbers.
Therefore white can hardly defend in this situation. Moreover, since black
can capture a knight with P*3g, his advantage is obvious.

In Diagram G, white's power in the center is so strong that black cannot be
happy in spite of the exchange of knight for gold. It should be clear that
the speedy 7. P-8c+ Gx8c 8. N*9e is a better attack. If 7... Rx8c, black will
keep the advantage with 8. Rx8c+ Gx8c 9. R*8a.

Even if white defends with 8...P*8d in Diagram 5, black strongly exchanges
rooks with 9. Nx8c+ Rx8c 10. Rx8d Rx8d 11. Bx8d. The result will be still
favorable for him as his king position is stronger than white's.